Method of cementing parts of shoes



May 3, 1932. L. KEITH 1,856,562-

METHOD OF CEMENTING PARTS OF SHOES Filed May 3l, 1929 L Il @1m 1 l E i 8: l l m :B f@ y l f /0-- gq' 2 A? 3| f Patented May 3, 1932 SERV-ING L. KEITH, OF HAVERHILL, MASSACHUSETTS METHOD OF CMENTING PARTS 'OF SHOES Application tiledv May 31, 1929. Serial No. 367,309.

This invention relates to methods of cementing certain parts of shoes particularly sock linings and inner soles, which are adapted to be employed in connection with a common type of cementing machine, such as the type in Which a horizontally disposed grid is normally submerged in a cement containing tray and is lifted therefrom, Iso that the part to which the cement is to be applied may be laid on the cement carrying top face of the grip.

In cementing sock linings to the bottoms of shoes, particularly those which are made of thin leather, so that the surface which is adhesively connected to the shoe bottom is somewhat absorbent, it has been found necessary to apply a relatively heavy coating of cement, as compared with many other conditions in cementing parts of shoes, to insure suliiciently strong adhesion. Vhen, however,

- an adhesive of the character most commonly employed for this purpose is used in sufficient quantity, it becomes somewhat brittle when dry, soffgthat it is liable to make an objectionable criicking sound when the part to 'which it is applied is bent.

The objects of my invention are to provide an improved method of cementing sock linings to shoe bottoms which will avoid the objectionable feature above'jnoted, and which will, at the same time, enable the quantity of adhesive Which is employed for the purpose to be substantially reduced.

I accomplish these objects, primarily, by 'd applying the adhesive to a relatively large proportion of the area of the surface of the heel and shank portions of the sock lining surface and to a relatively small portion of the area of the fore part thereof and particular-ly by applying it in transverse strips to said heel and shank portion and in dots, or small separate patches to the fore part portion.

For a more complete disclosure of the invention reference is now made to the following specification, in connection with the accompanying drawings, in which F ig. 1 is a plan view of a form of grid which may be employed in performing the herein described method.

Figs. 2 and 3 are sectional views thereof, at lines 2*-2 and 3-3 respectively of Fig. 1.

Fig. 4 is a longitudinal sectional view of the complete apparatus.

In the drawings a cementing machine is illustrated having a cementing grid which is primarily constructed and arranged for use in performing the herein describedmethod. Said grid is of elongated form and of somewhat greater length and Width than the coro0 responding dimensions of a shoe sole of the largest size which is likely to be applied thereto, said grid being composed of a series of transversely disposed bars, which are assembled in the manner disclosed in my prior o5 Patent No. 1,311,605 and comprises transverse end bars 10 which are connected by a pair of longitudinal side rods 11, on which transverse cement applying bars 12 and 13 are mounted and separated by spacing sleeves 7o 14, all the parts being' clamped together by end nuts on the rods 11. The cementing bars which are employed are of two types, the bars 12 being preferably of the zig-zag type shown in the patent to Smith No. 1,288,247 75 and the bars 13 being of the comb type shown in the patent to McMurray No. 1,29 ,14=7, each bar 12 having a top face adapted to apply the cement in a continuous zigzag stripe, and cach bar 13 having a series of cement 80 applying faces which are separated from each other and are adapted to apply the cement in dots. All of the cement applying top faces of the bars 12 and 13are disposed in the same horizontal plane surface. 85

The cementing bars 12, having the continuous cement applying surfaces, are arranged throughout the portion of the grid which approximately correspond to the heel and shank portion of the. sole and the spacing Washers Which are employed between the bars corresponding to the heel portion are relatively thin, so that the bars throughout the heel portion are set more closely together than those in the shank portion.

The series ot' bars 13, having the discontinuous cement applying surfaces. are arranged close to the bars 12 and provide a series of discontinuous cement-ing faces which extend throughout the surface of the fore part of a lo sock lining or inner sole of any size which is to be cemented thereon.

The grid is mounted, as customary, on a yoke 15 over a cement containing pan 16, in which it may be submerged and from which it may be lifted.

In using the device, after the grid has been submerged in cement and lifted, so that the surplus cement may flow away from the top surfaces, the sock lining to be cemented is laid ou the grid in a position in which its heel and shank portions are engaged by the bars 12 having the continuous cement applying surfaces, and the fore part portion thereof is entirely engaged by the barsl, or portion of the grid having the longitudinally and laterally discontinuous cement applying surfaces, as indicated in Fig. l, so that cgment will be applied in transverse stripes to the heel and shank portions of the lining and in dots to the fore part portions thereof throughout the'surfaces of said portions, the stripes of cement being applied in ,closer proximity to the heel portion than to the shank portion.

In practice it is immaterial if the sock lining is so placed on the grid that the front portion of its shank part is engaged by the adjacent bars 13, as this portion Will be suiiiciently cemented thereby.

When a sole or sock lining has been cemented in a shoe, as above described, cement will be applied` to a relatively large proportion of the area of the heel and shank portions, as compared With the proportion of the areaof the forepart to which it is applied, and I have ascertained that, by cementing the sock lining in this manner, it will be suiciently secured against displacement onthe shoe bottom and at the same time the cement, When dry, will not crack When the shoe is bent and will not detract from its flexibility. A substantial saving in the quantity of cement used is also made as compared with previous practice. It will be understood that the form of grid herein shown and described is merely illustrated of a construction which may be advantageously employed in carrying out the herein described method and that the type of bars employed, and the spacing thereof may be varied according to the character of the Work to be performed or as may appear to be advantageous.

I claim:

1. The method of cementing sock linings and inner soles to the bottom of shoes. which consists in simultaneously applying cement throughout the surface of the heel'and shank parts to a relatively large proportion of the area thereof, and throughout the ball and adjacent fore part portions to a. relatively small proportion of the'area of such portions, and

' then placing the part thus cemented in position in the shoe.

2. The method of cementing sock linings surface of the heel and shank parts in continnous stripes to a relatively large pro ortion of theiarea thereof, and throughout t e ball and adjacent fore part portions in spaced dots or patches to a relatively small proportion of the area thereof, and then placing the part cemented in position in the shoe.

In testimony whereof, I have signed my name to this specification.

IRVING L. KEITH. 

